Pythagoras's Theorem for Parallelograms/Historical Note
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Historical Note on Pythagoras's Theorem for Parallelograms
Pythagoras's Theorem was extended by Pappus of Alexandria in this interesting manner of which Pythagoras's Theorem is a special case.
Sources
- 1992: George F. Simmons: Calculus Gems ... (previous) ... (next): Chapter $\text {A}.8$: Pappus (fourth century A.D.)